Rotation mechanism for rock drills



INVENTOR. mz'fh tr".

HIS ATTORNEY Feb. 23, 1932. w; A. SMITH, JR

ROTATION MECHANISM FOR ROCK DRI LLS I Filed May 25, 1929 mum A s The objects oftheinvention are to conzo 'the practice of the invention,

Patented eb. 23, 71932 WILLIAM A. smrrmzra, on PHILLII'SBURG, NEW JERSEY; nssrenonrojmennsoLn- BAND GOMIPANY,,OF JERSEYCITY,

new JERSEY, A" conPcnaTIon-on' NEW JERSEY I jnom'rron vrncnanrs vrFons nocx nalmis 1 I a 1 ,aiipncfi he; may This in'vention relatesto rock drills, but more particularly to a rotation mechanism for fluid actuated rock drills of the h'ammer i itype. stantly change, the; position fof the working implement on the work for each blow of the hammer piston, to' maintain the' Weight and the length cf'the' rock drill to a minimum and to rigidly support the rotation inechanism. I j Y 'Other objects will be in part obvious and I in part pointed, out hereinafter.

In the drawings illustrating the invention and in which similarreference characters re fer to similar parts, Figure 1 is a longitudinal sectional elevation of a rock drill equipped with rotation. v mechanism constructed 'in accordance with Figures Zand 3 aretransver se views taken looking in'the direction indicated by the ars n I Figure 4 is a perspective View cfthe rota-c tionbar. "f V i i Referring more particularly to the draw in'gs, the'inventionis shown embodied in a rock drill 'designatedgby and Comprising a cylinder'B and frontand back heads C and D respectively The cylinderB has a piston chamber E in which is disposed a -reciproca-- toryhammer piston F for delivering blows of impact to a Working implement G'extending into the .front head- C. In the construction shown a chuck H is housed in the front head C wherein it. is adapted to rotate and a chuck bushingJ'is inserted in the chuck H to interlockingly engagethe Working implementGr..' The'chuck H may also extend into the front end of the cylinder A and carries fluted chuck nutK which is in slidable engagement with flutes L of an extension 0 carried by the piston F. A bushing'P which forms a closure for the front end ofthepistonchamber E is providedwith 'an'eXtension C} which acts as a bearing'fOr therearwardend cf the TchuckI-I j i "Inthe rearward end of the cylinder Bis provided with internal gear 5 1929. i Seriai No tie-aces.

an e ylindfical bbr R- iii the t eram of which is disposed a back cylinder washer S to form aclosure for the rearwarc'l end of also acts as, a

r c y a rd rlofj he i fch mber thelpiston' chamber In additicni tcthe,v o 1 function described the back cylinder'washer 5 seat for rotation mechanism which, according'to thefinx' e'ntion, is located E; and comprises a rotation bar' T extending-1 throughthe-frontcylinder washer s'fandflis a pluralityof 'fiutes U to in-' threaded in the rearward end ofthe piston F.

The rotation bar T;,jcarries an integral v flange X located in the bore and which seats upon the cylinder washer S' and acts} as a support'for shafts Y u'pon which areincunted pinions Z to mesh Wltllfll'l internal gear 6' also in the bore R and supportedby the back cyl-g inderv washer S. The shafts Y are preferably 7 secured fixedly to the flange X, v 1 through Figural on the lines 22"and 33 The pinions'Z are adapted for free rotatihn I motion; 1

and rearwardly ofthe rotation mechanism is .one direction by the flangeX A plate '0 seated on the "rearward jendjofthe 7 serves to prevent 'endwise jmovement of the'pinions'Z the oppositedimotor designated generally by d] andc'omprising a cylinder andja rotor f rotatable in I the opposite end's'fof the achainbergin'thecylindere.' The charnber jg is shown as being of oblong sha'pe'while The rotor: f is "disposed cen- 7 and is keyed'to a drive shaft 'jwhich extends a a with one end throughthe p'latec and carries on this end a gearlciwhich'mes'hes with the fpinions Z. The oppositeendof the drive .jshaift'j extendsinto the backhead D and is ,prcvided'lwith a frictionless bearing o seate'd *inf'an'aperture pfin the back headi Similarly a frictionless bearing '9 is seated in'the 7' adjacent the gear. la. The back head D is seated directly upon the cylinder e and thus forms a closure for both the rearward end of the cylinder B and the motor chamber 9. The plate 0 serves in asimilar capacity for the front endof the chamber g.- V

The motor cl is of the multi-vane type'a nd the rotor f is accordingly provided with a pluralityjof-radial. slots 1 four'in this in stance, and inthe slotsm are slidable vaness' which are constantly held with their outermost edges against the'wallof the chamber' g by pressure fluid admitted into the bottoms of the slots through passages t in the rotor= The pressure fluid; utilized forthis purpose is'admitted directly into: the slots 1" from the chambers h; V In the construction shownwthe cylinder 0 also serves asa valve chest and accordingly has a valve chamber u of annular shape into fwhich open the supply passages '22 formed in this instance in, the cylinder e and leading from a supply reservoir w in the rearward endof the cylinder. 6. "Inthevalvechamber u is an annular. platevalvem of the oscillatory type to control the admission of pressure fluid to the ends of the oylinden Such pressure fluid is conveyed to the rearward end of the piston chamber .E through an inlet passage 9 extending. through the plate 0, the internal gear b and the back cylinder washer S, and pressure fluid is conveyedto the front endof the piston chambenE' through 7 an inlet passagez extending through the plate 0 and the cylinder B. Intermediate the ends of-the piston chamber E are a pair of: exhaust ports 2 which are controlled by thepiston F. -The admissionotpressure fluid into the drill is controlled by a throttle: valve 3 dis- :posed in the back headD and having a central chamber .4 which may be in constant communication with a source of pressure fluid supply through suitable connections (not shown). In the wall of thel throttle valve 3 is. a port 5 'to register witha-ipassage 6 leading to the supply reservoir w, 1

The throttle valve 31s preferably also used as a means for controlling the admission of pressure fluid to. the chamber 9, and whenso used maybe provided with a port 7 -which-,in

the open position ofthe throttle valve 3"is p adapted to register with a passage 8 inthe back head I) andleading to a groove 9 in the rearward endof' the cylinder e.

.From the groove 9. leadpassa ges 10 to -the expansion chambersh for conveying pressure ,fluid thereto to act againstthe. vanes s for rotating the rotor f. .f j I i The exhaust. otfluidfroih the expansion chambers k is effected through exhaust passages 11 opening in this instance into an ex- :haust chamber 12. formedin the periphery of the cylinder 6 to. act as amufller forthe fluid i iissuingfrom the expansion ichambers,and in ,tube .lmay bendisposed through these elethe wall of the cylinder B are exhaust ports 13 to convey the fluid from the exhaust chamber 12 to the atmosphere.

. The drill A may be provided with the usual means for supplying cleansing fluid to the ,drill steel. for removing the cuttings from the drill hole. The meansshown for this purpose comprises a water tube 14 which extends ments and is therefore supported by these eley -;mjents at points along: its length rtof protect it against the'whipping' action to which it would be otherwise subjected due tothevibration set up inv the drill during its operation, Any well knownlmeans, such as a plug -15 may be used, for securing: the watertube". .14 fixedly'in the back headDf The operation of. the device is as follows: When it is desired to set the piston Fand the rotor f in motionthe throttleivalve 3'may 9 be rotated to the open position' Pressure? fluid will then-flow .throughthe passage 6 into the supply reservoir; .w and from thence through thesupplypassages 1) into the valve chamber a where it will be distributed to. the- 9 ends of the piston chamber Eyby the valve mf" Inthe open position of the throttle gvalve pressure fluid will also'flow throughrthe pas sage-8, the groove 9 and the passages 10 into the expansion chambers h to act against the vanes sfforrotating the rotor f; lUpontheF admission of pressure fluid intothe exp ansion v chambers avportion thereof will' flow through the passages 25 into the slots r to act against the ends of the vanes s for pressing the outer 05 ends of the vanesflrmly against the walls of the chamber gto prevent leakage of pressure fluid from:one side ofthe vanes'to the other; As illustrated the rotorf is adapted to rotate ina counter-clockwise direction and as 10 .thevanes s overrun the exhaust passages-11 U the pressure fluid will be exhausted through these passages into the exhaust chamberl2 and fromthencc to the atmosphere through the exhaust ports 13; Inithis way the'rotor and thus also the associated'train ofelements connecting it with thechuck H will be constantlyirotated duringthe operation of the drill and the positionv of theworking imple ment' will therefore be continuallychanged j for each blow of the hammer piston F. j w Iclaimir. v.

1; In a rock drill, the combination Cilia cylinder and a chuck, apistoninthe cylinder slidably interlocked withthe chuck, arotary motor in the rearend of the cylinder coaxialwith the piston and comprisingaQrO- tor, a gear connected to rotatewith the rotor and disposed between the motorand the cylin5 der, a barslidably interlockedwith the piston, and a pinion carried by the bar and meshing with the gear to rotate the bar for transmitting rotary movement from the motor to the chuck. c

2. In a rock drill, the combination of a cylinder and a chuck, a piston in the cylinf der slidably interlocked with the chuck, a rotary motor in the rearward end of the'cylinder coaxial. with the piston and the chuck 10 and comprising a rotor, a gear connected to rotate with the rotor and disposed between the motor and the cylinder, a bar extending coaxially into the cylinder and carrying a flange, an internal gear encircling the gear,

and pinions carried by the flange and meshing with the gears to transmit the rotary movement of the rotor tothe chuck.

3. In a rock drill, the combination of a hammer cylinder and a'chuck, a piston in the 29 cylinder slidably interlocked with the chuck,

a motor cylinder in the hammer cylinder, a rotor in the motor cylinder, a bar interlockingly engaging the piston, means for transmitting the rotary movement of the rotor to the bar, a valve chamber in the motor cylinder, inlet passages leading from the valve chamber tothe cylinder, a valve in the valve chamber to controlthe inlet passages, and means for controlling the admission of pres- 30 sure fluid to the motor cylinder and the valve chamber.

4. In a rock drill, the combination of a hammer cylinder and a chuck, a motor in the cylinder comprising a motor cylinder and a rotor, a transmission extending coaxially through the hammer cylinder to transmit the rotary movement of the rotor to the chuck, a valve chamber in the motor cylinder, inlet passages leading from the valve chamber to 40 the hammer cylinder, a valve in the valve chamber controlling the inlet passages, and means for controlling the admission of pres-. sure fiuid'to the motor cylinder and the valve chamber. 7

5. In a rock drill, the combination of a hammer cylinder and a chuck, a piston in the cylinder slidably interlocked withthe chuck, a motor cylinder in the hammer cylinderhaving a groove forming an exhaust chamber, a

rotor in the motor cylinder, means extending 'coaxially into the hammer cylinder'and' interlockingly engaging the piston, means for transmitting the rotary movement of the rotor to the first said means, means for admitting pressure fluid to the cylinders, exhaust passages in the motor cylinder opening into the exhaust chamber, and exhaust ports in the hammer cylinder affording communication between the exhaust chamber and the at- 1 mosphere. I

In testimony whereof I have signed-this specification. e

WILLIAM A. SMITH, JR, 

